======================================
| [   15.012513][    C2] 1 lock held by ksoftirqd/2/27:
| [ 15.012684][ C2] #0: ffffffff8ef774c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2570) 
| [   15.012995][    C2]
| [   15.012995][    C2] stack backtrace:
[   15.013211][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   15.013213][    C2] Call Trace:
[   15.013216][    C2]  <TASK>
[ 15.013218][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 15.013225][ C2] print_usage_bug.part.0 (kernel/locking/lockdep.c:4048) 
[ 15.013229][ C2] mark_lock_irq (kernel/locking/lockdep.c:4013 kernel/locking/lockdep.c:4059 kernel/locking/lockdep.c:4270) 
[ 15.013233][ C2] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 15.013238][ C2] ? save_trace (kernel/locking/lockdep.c:595) 
[ 15.013251][ C2] mark_lock (kernel/locking/lockdep.c:4756) 
[ 15.013255][ C2] mark_usage (kernel/locking/lockdep.c:4645) 
[ 15.013258][ C2] __lock_acquire (kernel/locking/lockdep.c:5194) 
[ 15.013261][ C2] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 15.013265][ C2] lock_acquire.part.0 (kernel/locking/lockdep.c:473 kernel/locking/lockdep.c:5873) 
[ 15.013268][ C2] ? simple_pin_fs (fs/libfs.c:1067) 
[ 15.013272][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 15.013276][ C2] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5834) 
[ 15.013279][ C2] ? simple_pin_fs (fs/libfs.c:1067) 
[ 15.013283][ C2] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 15.013287][ C2] ? simple_pin_fs (fs/libfs.c:1067) 
[ 15.013290][ C2] simple_pin_fs (fs/libfs.c:1067) 
[ 15.013294][ C2] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 15.013297][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 15.013305][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 15.013309][ C2] ? __sk_destruct (./include/linux/instrumented.h:96 ./include/linux/atomic/atomic-instrumented.h:400 ./include/linux/refcount.h:389 ./include/linux/refcount.h:432 ./include/linux/refcount.h:450 ./include/net/net_namespace.h:287 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 15.013317][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 15.013319][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 15.013323][ C2] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 15.013328][ C2] ? kthread (kernel/kthread.c:464) 
[ 15.013330][ C2] ? ret_from_fork (arch/x86/kernel/process.c:148) 
[ 15.013333][ C2] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 15.013336][ C2] ? migrate_enable (./arch/x86/include/asm/preempt.h:104 ./include/linux/preempt.h:481 ./include/linux/preempt.h:481 kernel/sched/core.c:2427) 
[ 15.013340][ C2] ? __pfx_migrate_enable (kernel/sched/core.c:2402) 
[ 15.013345][ C2] __put_net (net/core/net_namespace.c:732) 
[ 15.013349][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 15.013353][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 15.013356][ C2] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 15.013360][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 15.013364][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 15.013367][ C2] ? note_gp_changes (kernel/rcu/tree.c:1326 (discriminator 1)) 
[ 15.013370][ C2] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 15.013374][ C2] rcu_core (kernel/rcu/tree.c:2834) 
[ 15.013378][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 15.013382][ C2] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 15.013385][ C2] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 15.013388][ C2] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 15.013392][ C2] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 15.013396][ C2] kthread (kernel/kthread.c:464) 
[ 15.013399][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 15.013401][ C2] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 15.013403][ C2] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 15.013406][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 15.013409][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 15.013412][ C2] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 15.013415][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 15.013417][ C2] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   15.023747][    C2] RCU nest depth: 0, expected: 0
| [   15.023917][    C2] INFO: lockdep is turned off.
| [   15.024089][    C2] Preemption disabled at:
| [ 15.024091][ C2] handle_softirqs (kernel/softirq.c:553) 
[   15.024448][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   15.024450][    C2] Call Trace:
[   15.024451][    C2]  <TASK>
[ 15.024453][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 15.024458][ C2] __might_resched (kernel/sched/core.c:8796) 
[ 15.024464][ C2] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 15.024468][ C2] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 15.024471][ C2] ? simple_recursive_removal (fs/libfs.c:614) 
[ 15.024475][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 15.024480][ C2] ? do_raw_spin_unlock (./arch/x86/include/asm/atomic.h:23 ./include/linux/atomic/atomic-arch-fallback.h:457 ./include/linux/atomic/atomic-instrumented.h:33 ./include/asm-generic/qspinlock.h:57 kernel/locking/spinlock_debug.c:101 kernel/locking/spinlock_debug.c:141) 
[ 15.024487][ C2] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 15.024489][ C2] ? do_raw_spin_unlock (./arch/x86/include/asm/atomic.h:23 ./include/linux/atomic/atomic-arch-fallback.h:457 ./include/linux/atomic/atomic-instrumented.h:33 ./include/asm-generic/qspinlock.h:57 kernel/locking/spinlock_debug.c:101 kernel/locking/spinlock_debug.c:141) 
[ 15.024493][ C2] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 15.024498][ C2] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 15.024501][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 15.024505][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 15.024508][ C2] ? __sk_destruct (./include/linux/instrumented.h:96 ./include/linux/atomic/atomic-instrumented.h:400 ./include/linux/refcount.h:389 ./include/linux/refcount.h:432 ./include/linux/refcount.h:450 ./include/net/net_namespace.h:287 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 15.024513][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 15.024516][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 15.024519][ C2] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 15.024522][ C2] ? kthread (kernel/kthread.c:464) 
[ 15.024525][ C2] ? ret_from_fork (arch/x86/kernel/process.c:148) 
[ 15.024528][ C2] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 15.024532][ C2] ? migrate_enable (./arch/x86/include/asm/preempt.h:104 ./include/linux/preempt.h:481 ./include/linux/preempt.h:481 kernel/sched/core.c:2427) 
[ 15.024535][ C2] ? __pfx_migrate_enable (kernel/sched/core.c:2402) 
[ 15.024541][ C2] __put_net (net/core/net_namespace.c:732) 
[ 15.024544][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 15.024548][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 15.024550][ C2] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 15.024555][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 15.024558][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 15.024561][ C2] ? note_gp_changes (kernel/rcu/tree.c:1326 (discriminator 1)) 
[ 15.024564][ C2] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 15.024568][ C2] rcu_core (kernel/rcu/tree.c:2834) 
[ 15.024572][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 15.024576][ C2] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 15.024580][ C2] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 15.024582][ C2] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 15.024586][ C2] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 15.024590][ C2] kthread (kernel/kthread.c:464) 
[ 15.024593][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 15.024595][ C2] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 15.024598][ C2] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 15.024601][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 15.024604][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 15.024607][ C2] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 15.024610][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 15.024612][ C2] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   16.631046][    C0] INFO: lockdep is turned off.
| [   16.631205][    C0] Preemption disabled at:
| [ 16.631206][ C0] handle_softirqs (kernel/softirq.c:553) 
| [   16.631549][    C0] Tainted: [W]=WARN
[   16.631551][    C0] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   16.631553][    C0] Call Trace:
[   16.631554][    C0]  <TASK>
[ 16.631556][ C0] dump_stack_lvl (lib/dump_stack.c:123) 
[ 16.631563][ C0] __might_resched (kernel/sched/core.c:8796) 
[ 16.631570][ C0] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 16.631574][ C0] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 16.631577][ C0] ? simple_recursive_removal (fs/libfs.c:614) 
[ 16.631582][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 16.631586][ C0] ? do_raw_spin_unlock (./arch/x86/include/asm/atomic.h:23 ./include/linux/atomic/atomic-arch-fallback.h:457 ./include/linux/atomic/atomic-instrumented.h:33 ./include/asm-generic/qspinlock.h:57 kernel/locking/spinlock_debug.c:101 kernel/locking/spinlock_debug.c:141) 
[ 16.631592][ C0] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 16.631595][ C0] ? do_raw_spin_unlock (./arch/x86/include/asm/atomic.h:23 ./include/linux/atomic/atomic-arch-fallback.h:457 ./include/linux/atomic/atomic-instrumented.h:33 ./include/asm-generic/qspinlock.h:57 kernel/locking/spinlock_debug.c:101 kernel/locking/spinlock_debug.c:141) 
[ 16.631598][ C0] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 16.631604][ C0] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 16.631607][ C0] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 16.631612][ C0] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 16.631616][ C0] ? __sk_destruct (./include/linux/instrumented.h:96 ./include/linux/atomic/atomic-instrumented.h:400 ./include/linux/refcount.h:389 ./include/linux/refcount.h:432 ./include/linux/refcount.h:450 ./include/net/net_namespace.h:287 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 16.631621][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 16.631625][ C0] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 16.631628][ C0] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 16.631632][ C0] ? kthread (kernel/kthread.c:464) 
[ 16.631635][ C0] ? ret_from_fork (arch/x86/kernel/process.c:148) 
[ 16.631639][ C0] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 16.631644][ C0] ? migrate_enable (./arch/x86/include/asm/preempt.h:104 ./include/linux/preempt.h:481 ./include/linux/preempt.h:481 kernel/sched/core.c:2427) 
[ 16.631648][ C0] ? __pfx_migrate_enable (kernel/sched/core.c:2402) 
[ 16.631651][ C0] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 16.631659][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 16.631663][ C0] __put_net (net/core/net_namespace.c:732) 
[ 16.631667][ C0] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 16.631671][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 16.631673][ C0] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 16.631678][ C0] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 16.631682][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 16.631685][ C0] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 16.631694][ C0] rcu_core (kernel/rcu/tree.c:2834) 
[ 16.631698][ C0] handle_softirqs (kernel/softirq.c:579) 
[ 16.631702][ C0] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 16.631706][ C0] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 16.631709][ C0] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 16.631713][ C0] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 16.631717][ C0] kthread (kernel/kthread.c:464) 
[ 16.631720][ C0] ? __pfx_kthread (kernel/kthread.c:413) 
[ 16.631722][ C0] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 16.631725][ C0] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 16.631728][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 16.631731][ C0] ? __pfx_kthread (kernel/kthread.c:413) 
[ 16.631734][ C0] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 16.631737][ C0] ? __pfx_kthread (kernel/kthread.c:413) 


Finger prints:
mark_lock_irq:mark_lock:mark_usage:__lock_acquire:_raw_spin_lock
handle_softirqs:dump_stack_lvl:__might_resched:down_write:simple_recursive_removal